My surveying boss had those from the factory on his Super Duty, great summer/highway tires, but terrible on the dirt or in the winter, and he just had the 5. 4L V8, not the power joke. Needless to say, he bought a set of Wrangler ATS for the winter, night and day difference.
With the torquemonster CTD and those tires, you could put on a "dirt trackin" show :-laf